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2x3 Transformation Matrix


i would like to know how to read the information of a 2x3 Transformation Matrix. If i am right, it contains the rotation, the translation x/y and the scale x/y. But what is the sixth value used for ?

I need to read the rotation from the matrix in RAD or DEG.

I hope someone can explain me the 2x3 Transformation Matrix a little more detailed.